From time to time I read on FTE about trucks that pull 20+ MPG all day long on the freeways. I don't have a magical truck... Yesterday I took a 2.5 hour ride on the freeway (65mph).

Slight breeze, zero degrees outside. 100% cruise control and I reset the meter after the truck was up to temp and I was at freeway speed. I didn't see any regens but one could have occurred and I missed the message. Cruise control was set at 74mph.

This is the exact mileage (mpg) my 2011 truck had. Had been hoping for the magical 25mpg truck.

 

right where I sit if I do a hwy run...or with a load in the rear. Non towing.


I'd say no regens either.


If you ask me for over 4 tons rolling down that road that isn't bad.

 

on a dually? never seen mine above 17 (empty highway).. usually 15ish..

my 250 SRW I could see the dash at 18+, never 20.

 

That is what I would expect to see, at that temperature and speed.
Try to do the same test next summer and compare !

 

I got 18.5 on a trip to Northern part of NJ the other week. Was really surprised at that. We went to pick up a secretaries desk.

 

Pretty much the exact same MPG that I average. As mentioned I think it's pretty acceptable for the weight and size of these rigs.

 

I haven't paid much attention to mine, but when I flip thru and look at the average, it's usually in the mid to low 14's. That's combined mileage, city, highway and light towing (light for these beasts anyway). And I'm running 35" Toyo's, so all in all, that's pretty good. Considering the weight of the truck and I drive it like I can afford to fix it......

 

I own a 2011 f350 DRW Lariat and average around 15-16 with my in-town commute, up from 14-15 before the reflash. On the highway at 65, I can get up to 18-19. I rented a 2014 f250 XLT for a road trip once, and it got 23 on the highway at 65. I think mpg is so subjective because of the variables. I expect a lighter truck (XLT vs. Lariat, SRW vs DRW) to get better fuel economy, but terrain and environment play a significant factor. I doubt there are any magic trucks out there, but the right combination of factors (base model, flat terrain, warm temperature, high quality fuel) could add up for a person to achieve what seems like unobtainable fuel economy.

 

I haven't been on any long trips yet but I can say that around town with a little freeway thrown in my 2005 6.0 gat app. 2 to 4 mpg better than my 2015 6.7. My 2015 is a 4 by 4 and the 2005 was a 4 by 2. That is per the lie O meter on each truck.

 

It's a 4 ton brick, I think the OP's mileage is normal. After 60 mph aerodynamic drag starts to really kick in and I believe it builds exponentially. Try the same trip at 55 mph, dollars to donuts there will be a difference, if you can stand going that slow.

 

I made a lot of trips between Utah and North Dakota. Usually about 14 hours each way. Most of the trips were on I-15 and I-90 at 80 mph, with a couple hours of two lane hiway between Idaho Falls and Bozeman at 65 mph. I almost always got 18.0 to 18.5 for the trip average.

I made a slower trip between Salt Lake City and Jackson Hole where I stayed at 65 mph for the 250 miles. The truck got 22 mpg for the trip up and 23 mpg for the trip back. So the mileage jumps when you slow down.

Around home with chasing between jobsites, lumber yards, plumbing supply house, banks etc, I stay pretty consistent at 14 mpg.

And hook a trailer up and I'm at 11 mpg. Doesn't seem to matter what trailer. A 13,000 lbs Gooseneck or a flatbed with a skid loader on it. I'm getting 11.

I'm running a pretty much stock truck, 3.55 rear end with the 20" rims and tires.

 

Absolutely.

On a recent trip down south I reset my LOM while cruising down the highway at 60-65ish. I was right around 20 or so. When I pushed on the go pedal some more I dropped down around 18. This was all on quite flat roads and I am assuming mon-winter fuel due to the southern temps.

I usually get around 15 on winter blend with combination driving over rolling terrain. I have the 355 rear.

It would be interesting to see if higher cetane fuel gives better mpg's.

 

My '12 6.7 makes 1.5 to 2 mpg better than my '05 6.0 on identical equipped trucks.

 

I'm happy with my 15 mpg my old 5.4 got 10mpg rolling downhill with gal force winds pushing me.

 

I have decided to simply stop looking and no longer check my MPG. I may not get the MPG of a SRW truck, but I can travel almost twice a far between fuel fill ups. Because my wide hips carry twice the fuel of most.....LOL!!!!!

And yes, I know there are one or two of you out there who carry twice and trice mine.